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This allows researchers to account for variation by comparing the known records of C levels in the tree record, looking for a tree record that has the same proportion of radiocarbon.The overlapping nature of the tree records means this is the most accurate record we have.This does not mean that we have a precise year of 3780BC, it means we then need to calibrate through other methods that will show us how atmospheric concentrations of the C isotope has changed - most typically through the dendrochronology records (tree ring data) (10).Very old trees such as North American Bristlecone Pine are ideal for constructing long and accurate records of the state of the atmosphere.This new method was based on gas and liquid scintillation counting and these methods are still used today, having been demonstrated as more accurate than Libby's original method (3).Willard Libby would receive a Nobel Prize for Chemistry in 1960.

In 1979, Desmond Clark said of the method “we would still be foundering in a sea of imprecisions sometime bred of inspired guesswork but more often of imaginative speculation” (3).

The sample passes through several accelerators in order to remove as many atoms as possible until the C pass into the detector.

These latter atoms are used as part of the calibration process to measure the relative number of isotopes (9).

AMS works slightly differently; it converts the atoms of the sample into fast-moving ions so that they become charged atoms.

By applying magnetic and electrical fields, the mass of these ions is measured and the accelerator is used to remove ions that might contaminate the dating.

In 1979, Desmond Clark said of the method “we would still be foundering in a sea of imprecisions sometime bred of inspired guesswork but more often of imaginative speculation” (3).

The sample passes through several accelerators in order to remove as many atoms as possible until the C pass into the detector.

These latter atoms are used as part of the calibration process to measure the relative number of isotopes (9).

AMS works slightly differently; it converts the atoms of the sample into fast-moving ions so that they become charged atoms.

By applying magnetic and electrical fields, the mass of these ions is measured and the accelerator is used to remove ions that might contaminate the dating.

Typically, a Master's Degree in chemistry is required because of the extensive lab work.